Ensure that all your data has been uploaded to your Back Office before continuing. You can verify this by launching iCapture on the device to delete. Connect to Wifi and touch Options and then Sync To Server. When Captures waiting to upload reads "0", the device is ready to be removed.

Click on the "Device Management" tab

Click on "View Details" by the device that you want to delete

Click on "Delete this Device"

Click "Yes, Delete this Device" on the warning to complete the process